From the 4848r picture I'd assume that the legs are a clip on section of stilits, and the klickies feet are comcealed in the knees.
Like you guys, I at first assumed the temple guardians were discrete figures, but it makes for better play value if there's a normal klicky inside. An adventurer could be captured, transformed into a guardian and subsequently rescued, for example.
Like the knights who have removable armor, I always think more pieces are better because then you can act out dressing for combat. The one piece arms may be more practical for some activities, but they do reduce play value in other ways.